diff --git a/README.md b/README.md
index 2643f6acc996093c270e05d93725347e06eaa8f7..688e1994db6c599fd38156af359751cfd58fbaea 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,10 @@
 ==================================================
 
 **Note:** This is an unofficial summary, no warranty for correctness
-nor completeness.
+nor completeness.  Furthermore, this summary is consciously not
+complete, and a few `TODO`s have been scattered around the TeX sources
+for those interested in helping out with what I couldn't find the time
+to finish.
 
 This summary is influenced by two previous ones ([1][prev1],
 [2][prev2]), and extends a previous [AI1 summary][ai1-summary]. To