diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index e4a8cb0..19641da 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.5.0)
 
-project(AmpliCI VERSION 2.1)
+project(AmpliCI VERSION 2.1.099)
 
 set(CMAKE_C_COMPILER gcc)
 
diff --git a/src/options.c b/src/options.c
index 950e646..1b5a5be 100644
--- a/src/options.c
+++ b/src/options.c
@@ -631,7 +631,7 @@ void fprint_usage(FILE *fp, const char *exe_name, const char *command, void *obj
 	for (size_t i = start; i < strlen(exe_name); ++i)
 		fputc(toupper(exe_name[i]), fp);
 	//fprintf(fp, "(%d)\n", 1);
-	fprintf(fp, "(v2.1)\n");
+	fprintf(fp, "(v2.1.099)\n");
 	/* default command is to cluster */
 	if (!command) {
 		command = "";
diff --git a/src/statistics.c b/src/statistics.c
index 7ed77bf..76c2518 100644
--- a/src/statistics.c
+++ b/src/statistics.c
@@ -35,7 +35,7 @@ double dpoisbind(unsigned int n, unsigned int k, double *perr)
 				pnj[i] = perr[j - 1] * pnj[i - 1]
 						+ (1 - perr[j - 1]) * pnj[i];
 		}
-		pnj[0] = (1 - perr[j]) * pnj[0];
+		pnj[0] = (1 - perr[j-1]) * pnj[0];
 //		fprintf(stderr, "%e\n", pnj[k]);
 	}