diff --git a/.gitmodules b/.gitmodules
index 32846bc..fce6e5e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,5 +1,3 @@
 [submodule "dynamic-memory-api-0"]
 	path = dynamic-memory-api-0
-	url = https://git.landgrafhomyak.ru/MemoryManagement/dynamic-memory-api-0.git
-[submodule ".\\dynamic-memory-api-0\\"]
-	url = https://git.landgrafhomyak.ru/MemoryManagement/dynamic-memory-api-0.rs
+	url = https://git.landgrafhomyak.ru/MemoryManagement/dynamic-memory-api-0.rs.git
diff --git a/src/api.rs b/src/api.rs
index b5bc9c2..5befbce 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -20,7 +20,7 @@ impl WindowsVirtualMemoryApi {
         };
     }
 
-    pub(super) fn changeReservationsCount(&self, diff: isize) {
+    pub(crate) fn _changeReservationsCount(&self, diff: isize) {
         let mut current = self.totalReservationsOwned.load(Ordering::Relaxed);
         loop {
             let updated = current.strict_add_signed(diff);
@@ -36,9 +36,15 @@ impl WindowsVirtualMemoryApi {
         }
     }
 
-    fn roundUpPages(&self, pagesCount: usize) -> usize {
+    fn _roundUpPages(&self, pagesCount: usize) -> usize {
         return (pagesCount * self.pageSize + (self.allocationGranularity - 1)) / self.pageSize;
     }
+
+    fn _assertPagesCount(&self, pagesCount: usize) {
+        if pagesCount == 0 {
+            panic!("Can't reserve zero pages");
+        }
+    }
 }
 
 unsafe impl VirtualMemoryApi for WindowsVirtualMemoryApi {
@@ -49,7 +55,8 @@ unsafe impl VirtualMemoryApi for WindowsVirtualMemoryApi {
     }
 
     fn reserveMemory<'s>(&'s self, pagesCount: usize) -> Option<Self::Reservation<'s>> {
-        match WindowsReservation::tryReserve(self, None, self.roundUpPages(pagesCount)) {
+        self._assertPagesCount(pagesCount);
+        match WindowsReservation::tryReserve(self, None, self._roundUpPages(pagesCount)) {
             ExtendResult::OutOfMemory => return None,
             ExtendResult::ContinuationIsBusy => {
                 panic!("Unreachable (system reported that region is busy, but it wasn't specified)")
@@ -61,9 +68,10 @@ unsafe impl VirtualMemoryApi for WindowsVirtualMemoryApi {
     unsafe fn extendReservation<'s>(
         &'s self,
         base: &Self::Reservation<'s>,
-        pagesCount: usize,
+        extraPagesCount: usize,
     ) -> ExtendResult<WindowsReservation<'s>> {
-        return WindowsReservation::tryReserve(self, Some(base), self.roundUpPages(pagesCount));
+        self._assertPagesCount(extraPagesCount);
+        return WindowsReservation::tryReserve(self, Some(base), self._roundUpPages(extraPagesCount));
     }
 }
 
diff --git a/src/reservation.rs b/src/reservation.rs
index 5c694be..4a5b90d 100644
--- a/src/reservation.rs
+++ b/src/reservation.rs
@@ -35,7 +35,7 @@ impl<'s> WindowsReservation<'s> {
             }
         }
 
-        owner.changeReservationsCount(1);
+        owner._changeReservationsCount(1);
 
         let reservation = WindowsReservation {
             owner: owner,
@@ -69,7 +69,7 @@ impl<'s> WindowsReservation<'s> {
     }
 
     unsafe fn _release(&mut self) {
-        self.owner.changeReservationsCount(-1);
+        self.owner._changeReservationsCount(-1);
         winapi_wrappers::release(self.start);
     }
 }