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diff --git a/doc/html/pcre_compile.html b/doc/html/pcre_compile.html
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@@ -70,7 +70,9 @@ PCRE_NO_UTF8_CHECK.
</P>
<P>
The yield of the function is a pointer to a private data structure that
-contains the compiled pattern, or NULL if an error was detected.
+contains the compiled pattern, or NULL if an error was detected. Note that
+compiling regular expressions with one version of PCRE for use with a different
+version is not guaranteed to work and may cause crashes.
</P>
<P>
There is a complete description of the PCRE native API in the