README.md in as_deprecation_tracker-1.2.0 vs README.md in as_deprecation_tracker-1.3.0

@@ -86,12 +86,11 @@
 number and method specification may be given for more specificity. The line
 number may vary by up to ten lines from the recorded number by default (see
 `line_tolerance` to tune). Usually the filename and method name are sufficient
 to match the caller without needing line numbers.
 
-The message is an exact string match, but if it's a multi-line message then not
-all lines need to be specified. Only the first lines given will be compared
-against the deprecation message.
+The message is an exact string match on the _start_ of the deprecation message,
+so not all of the original deprecation message needs to be specified.
 
 Additional whitelist files may be placed below the root of each Rails engine
 and will be loaded at startup in addition to the main Rails root config file.
 
 Entries can be added programmatically by calling