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-rw-r--r--RELEASE-NOTES.md1
-rw-r--r--src/gemma.cpp1
2 files changed, 2 insertions, 0 deletions
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 8348a20..6e03fd9 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -8,6 +8,7 @@ and
 
 * Changed banner to show Copyright (C) 2012–2021, Xiang Zhou, Pjotr Prins and team
 * Fixed tests for new Debian stable release - mostly roundoff confusion
+* Documented `-lmm 9` which adds additive effect to `-lmm 2`
 
 ## ChangeLog v0.98.4 (2021/01/29)
 
diff --git a/src/gemma.cpp b/src/gemma.cpp
index cde40b5..4d92a79 100644
--- a/src/gemma.cpp
+++ b/src/gemma.cpp
@@ -539,6 +539,7 @@ void GEMMA::PrintHelp(size_t option) {
     cout << "                   3: Score test" << endl;
     cout << "                   4: 1-3" << endl;
     cout << "                   5: Parameter estimation in the null model only"
+    cout << "                   9: same as option 2, but with additive effect"
          << endl;
     cout << " -lmin     [num]          "
          << " specify minimal value for lambda (default 1e-5)" << endl;