diff --git a/.gitignore b/.gitignore
index dfa48fa..750c0a4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -84,3 +84,10 @@ assets/**/last.spl
 
 # packaged releases (attached to Gitea releases, not tracked)
 RedPlanet-*.zip
+
+# Crash dumps sent in by testers. Read them with cdb against the matching
+# Release\rpl4opt.pdb - the PE timestamp in the dump says which build, and
+# the symbols only mean anything if it matches. They are not ours to keep
+# in the history: a minidump carries process memory and the sender's own
+# file paths.
+/Crashdmp/