diff --git a/NEWS.md b/NEWS.md
index f28a0f2..719d2a0 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -3,6 +3,12 @@
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased][]
+
+### Fixed
+
+* Added a fallback for the `Pages` attribute in a `@bibliography` block to behave as in pre-`1.3.0`: If `Pages` references a file with a path relative to the `docs/src` directory (which was the unintentional requirement pre-`1.3.0`), this now works again, but shows a warning that the name should be updated to be relative to the folder containing the file that contains the `@bibliography` block. This fixes the `v1.3.0` release arguably having been "breaking" [[#59][]] in that anybody who was using `Pages` pre-1.3.0 would have had to use paths relative to `docs/src`, even though that was a workaround for a known bug [[#22][]]. Note that whenever `Pages` references the current file, `@__FILE__` should be used.
+
 
 ## [Version 1.3.0][1.3.0] - 2023-11-01
 
@@ -42,6 +48,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Any `@bibliography` block is now internally expanded into an internal `BibliographyNode` instead of a raw HTML node. This `BibliographyNode` can then be translated into the desired output format by `Documenter.HTMLWriter` or `Documenter.LaTeXWriter`. This is how support for bibliographies with `format=Documenter.LaTeX()` can be achieved.
 * The routine `format_bibliography_reference` must now return a markdown string instead of an HTML string.
 
+**Upgrade guidelines**:
+
+If anyone who was using custom styles, which rely on the [Internals](https://juliadocs.org/DocumenterCitations.jl/stable/internals/) of `DocumenterCitations`, this release will almost certainly break the customization. See the above list of internal changes.
+
+There were some subtle changes in how DOI and URL fields are linked in the rendered documentation, which may require adjustments. In particular, in version `1.3.0`, non-`@article` entries that do not have both a `title` and a `booktitle` can only have a DOI *or* or URL, but not both. This most likely occurs for `@book` entries. For `@book` entries that have both a DOI and a URL, the URL should be placed in the `note` field (using `\url`/`\href`, as appropriate).
+
+There were several bugs and limitations in version `1.2.x`, for which some existing documentations may have been using workarounds. These workarounds my cause some breakage in the new version `1.3.0`. In particular:
+
+* The `Pages` attribute in a `@bibliography` in version `1.2.x` (unintentionally, and without documentation) required any names to be relative to the `docs/src` directory [[#22][]]. These names must be updated to be relative to to the folder containing the file which contains the `@bibliography` block. For the common usage where `Pages` was referring to the current file, `@__FILE__` should be used.
+
+* Pre-`1.3.0`, strings in entries in the `.bib` file were extremely limited in that there was no official support for any kind of `tex` macros. Only plain-text unicode was guaranteed to work in version `1.2.x`. As a workaround, some users exploited an (undocumented/buggy) implementation detail that would cause html or markdown strings inside the `.bib` file to "work", e.g. for adding links in a `note` field. These workarounds may break in `v1.3.0`. While unicode is still very much supported (`ö` over `\"{o}`), `.bib` files should be otherwise be written to be fully compatible with `bibtex`. For links in particular, the LaTeX `\href` macro should be used. Any `tex` commands that are not supported  (`Error: Unsupported command`) should be reported. Some `tex` characters (`$%@{}&`) that may have worked directly pre-`1.3.0` will have to be escaped in version `1.3.0`.
+
 
 ## [Version 1.2.1][1.2.1] - 2023-09-22
 
@@ -119,6 +137,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 [1.2.0]: https://github.com/JuliaDocs/DocumenterCitations.jl/compare/v1.1.0...v1.2.0
 [1.1.0]: https://github.com/JuliaDocs/DocumenterCitations.jl/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/JuliaDocs/DocumenterCitations.jl/compare/v0.2.12...v1.0.0
+[#59]: https://github.com/JuliaDocs/DocumenterCitations.jl/issues/59
 [#56]: https://github.com/JuliaDocs/DocumenterCitations.jl/pull/56
 [#53]: https://github.com/JuliaDocs/DocumenterCitations.jl/issues/53
 [#42]: https://github.com/JuliaDocs/DocumenterCitations.jl/pull/42
diff --git a/Project.toml b/Project.toml
index 8d83945..c44c9bd 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "DocumenterCitations"
 uuid = "daee34ce-89f3-4625-b898-19384cb65244"
 authors = ["Michael Goerz <mail@michaelgoerz.net>"]
-version = "1.3.0"
+version = "1.3.1-dev"
 
 [deps]
 AbstractTrees = "1520ce14-60c1-5f80-bbc7-55ef81b5835c"
diff --git a/src/expand_bibliography.jl b/src/expand_bibliography.jl
index 75a27b4..c7eb77b 100644
--- a/src/expand_bibliography.jl
+++ b/src/expand_bibliography.jl
@@ -1,3 +1,5 @@
+_ALLOW_PRE_13_FALLBACK = true
+
 """Pipeline step to expand all `@bibliography` blocks.
 
 Runs after [`CollectCitations`](@ref) but before [`ExpandCitations`](@ref).
@@ -273,12 +275,22 @@ function expand_bibliography(node::MarkdownAST.Node, meta, page, doc)
                 expected_file = normpath(doc.user.source, page_folder, name)
                 if isfile(expected_file)
                     @error "Invalid $(repr(name)) in Pages attribute of @bibliography block on page $(page.source): File $(repr(expected_file)) exists but no references were collected."
+                    push!(doc.internal.errors, :bibliography_block)
                 else
-                    # Files that don't contain any citations don't show up in
-                    # `page_citations`.
-                    @error "Invalid $(repr(name)) in Pages attribute of @bibliography block on page $(page.source): No such file $(repr(expected_file))."
+                    # try falling back to pre-1.3 behavior
+                    exists_in_src = isfile(joinpath(doc.user.source, name))
+                    valid_pre_13 = exists_in_src && haskey(page_citations, name)
+                    if _ALLOW_PRE_13_FALLBACK && valid_pre_13
+                        @warn "The entry $(repr(name)) in the Pages attribute of the @bibliography block on page $(page.source) appears to be relative to $(repr(doc.user.source)). Starting with DocumenterCitations 1.3, names in `Pages` must be relative to the folder containing the file which contains the `@bibliography` block."
+                        @debug "Add keys cited in $(abspath(normpath(doc.user.source, name))) to keys_to_show (pre-1.3 fallback)"
+                        push!(keys_in_pages, page_citations[name]...)
+                    else
+                        # Files that don't contain any citations don't show up in
+                        # `page_citations`.
+                        @error "Invalid $(repr(name)) in Pages attribute of @bibliography block on page $(page.source): No such file $(repr(expected_file))."
+                        push!(doc.internal.errors, :bibliography_block)
+                    end
                 end
-                push!(doc.internal.errors, :bibliography_block)
                 continue
             end
         end
diff --git a/test/test_bibliography_block_pages.jl b/test/test_bibliography_block_pages.jl
index 1914a64..e5c4db2 100644
--- a/test/test_bibliography_block_pages.jl
+++ b/test/test_bibliography_block_pages.jl
@@ -47,7 +47,8 @@ end
 
         @test success
         #! format: off
-        @test contains(output, prx("Error: Invalid \"index.md\" in Pages attribute of @bibliography block on page src/part3/section2/invalidpages.md: No such file \"src/part3/section2/index.md\"."))
+        @test_broken contains(output, prx("Error: Invalid \"index.md\" in Pages attribute of @bibliography block on page src/part3/section2/invalidpages.md: No such file \"src/part3/section2/index.md\"."))
+        @test contains(output, prx("Warning: The entry \"index.md\" in the Pages attribute of the @bibliography block on page src/part3/section2/invalidpages.md appears to be relative to \"src\"."))
         @test contains(output, prx("Error: Invalid \"p3_s1_page.md\" in Pages attribute of @bibliography block on page src/part3/section2/invalidpages.md: No such file \"src/part3/section2/p3_s1_page.md\"."))
         @test contains(output, prx("Error: Invalid \"noexist.md\" in Pages attribute of @bibliography block on page src/part3/section2/invalidpages.md: No such file \"src/part3/section2/noexist.md\"."))
         @test contains(output, "Warning: No cited keys remaining after filtering to Pages")
@@ -174,7 +175,8 @@ end
 
         @test !success
         #! format: off
-        @test contains(output, prx("Error: Invalid \"index.md\" in Pages attribute of @bibliography block on page src/part3/section2/invalidpages.md: No such file \"src/part3/section2/index.md\"."))
+        @test_broken contains(output, prx("Error: Invalid \"index.md\" in Pages attribute of @bibliography block on page src/part3/section2/invalidpages.md: No such file \"src/part3/section2/index.md\"."))
+        @test contains(output, prx("Warning: The entry \"index.md\" in the Pages attribute of the @bibliography block on page src/part3/section2/invalidpages.md appears to be relative to \"src\"."))
         @test contains(output, prx("Error: Invalid \"p3_s1_page.md\" in Pages attribute of @bibliography block on page src/part3/section2/invalidpages.md: No such file \"src/part3/section2/p3_s1_page.md\"."))
         @test contains(output, prx("Error: Invalid \"noexist.md\" in Pages attribute of @bibliography block on page src/part3/section2/invalidpages.md: No such file \"src/part3/section2/noexist.md\"."))
         @test contains(output, "Warning: No cited keys remaining after filtering to Pages")
diff --git a/test/test_bibliography_block_pages/src/part3/section2/invalidpages.md b/test/test_bibliography_block_pages/src/part3/section2/invalidpages.md
index 8ff61bd..9196081 100644
--- a/test/test_bibliography_block_pages/src/part3/section2/invalidpages.md
+++ b/test/test_bibliography_block_pages/src/part3/section2/invalidpages.md
@@ -2,12 +2,12 @@
 
 ## References from Nonexisting Pages
 
-Nothing should render here
+Nothing should render here (except for the fallback introduced in version 1.3.1)
 
 ```@bibliography
 Canonical = false
 Pages = [
-    "index.md",
+    "index.md",  # not valid in 1.3, valid in 1.3.1 (fallback)
     "p3_s1_page.md",
     "noexist.md",
 ]