diff --git a/c/include/prima/prima.h b/c/include/prima/prima.h
index 73042fe32a..bc8ce3c729 100644
--- a/c/include/prima/prima.h
+++ b/c/include/prima/prima.h
@@ -225,7 +225,7 @@ typedef struct {
     // N.B.: 1. ctol is absolute, not relative.
     // 2. ctol is used for choosing the returned x. It does not affect the iterations of the algorithm.
     // Default: NaN, which will be interpreted in Fortran as not present, in which case a default value
-    // of machine epsilon will be used.
+    // of sqrt(machine epsilon) will be used.
     double ctol;
 
     // data: user data, will be passed through the objective function callback
diff --git a/fortran/cobyla/cobylb.f90 b/fortran/cobyla/cobylb.f90
index 484ba32a3c..6c5bb9d9cb 100644
--- a/fortran/cobyla/cobylb.f90
+++ b/fortran/cobyla/cobylb.f90
@@ -17,7 +17,7 @@ module cobylb_mod
 !
 ! Started: July 2021
 !
-! Last Modified: Sunday, March 24, 2024 PM05:17:30
+! Last Modified: Sunday, March 24, 2024 PM08:32:31
 !--------------------------------------------------------------------------------------------------!
 
 implicit none